Brecht Van Lommel
c8fc23fdbe
Some GLSL compilers seem to not have problems with \ to break preprocessor directives. I couldn't find other places with similar code, but fixing this case by case is not ideal and the same issue may come up again.
949 lines
25 KiB
GLSL
949 lines
25 KiB
GLSL
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#define M_PI 3.14159265358979323846 /* pi */
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#define M_2PI 6.28318530717958647692 /* 2*pi */
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#define M_PI_2 1.57079632679489661923 /* pi/2 */
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#define M_1_PI 0.318309886183790671538 /* 1/pi */
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#define M_1_2PI 0.159154943091895335768 /* 1/(2*pi) */
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#define M_1_PI2 0.101321183642337771443 /* 1/(pi^2) */
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#define LUT_SIZE 64
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/* Buffers */
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uniform sampler2D colorBuffer;
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uniform sampler2D depthBuffer;
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uniform sampler2D maxzBuffer;
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uniform sampler2D minzBuffer;
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uniform sampler2DArray planarDepth;
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#define cameraForward normalize(ViewMatrixInverse[2].xyz)
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#define cameraPos ViewMatrixInverse[3].xyz
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#define cameraVec \
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((ProjectionMatrix[3][3] == 0.0) ? normalize(cameraPos - worldPosition) : cameraForward)
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#define viewCameraVec \
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((ProjectionMatrix[3][3] == 0.0) ? normalize(-viewPosition) : vec3(0.0, 0.0, 1.0))
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/* ------- Structures -------- */
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/* ------ Lights ----- */
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struct LightData {
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vec4 position_influence; /* w : InfluenceRadius (inversed and squared) */
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vec4 color_spec; /* w : Spec Intensity */
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vec4 spotdata_radius_shadow; /* x : spot size, y : spot blend, z : radius, w: shadow id */
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vec4 rightvec_sizex; /* xyz: Normalized up vector, w: area size X or spot scale X */
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vec4 upvec_sizey; /* xyz: Normalized right vector, w: area size Y or spot scale Y */
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vec4 forwardvec_type; /* xyz: Normalized forward vector, w: Light Type */
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};
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/* convenience aliases */
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#define l_color color_spec.rgb
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#define l_spec color_spec.a
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#define l_position position_influence.xyz
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#define l_influence position_influence.w
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#define l_sizex rightvec_sizex.w
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#define l_sizey upvec_sizey.w
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#define l_right rightvec_sizex.xyz
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#define l_up upvec_sizey.xyz
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#define l_forward forwardvec_type.xyz
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#define l_type forwardvec_type.w
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#define l_spot_size spotdata_radius_shadow.x
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#define l_spot_blend spotdata_radius_shadow.y
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#define l_radius spotdata_radius_shadow.z
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#define l_shadowid spotdata_radius_shadow.w
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/* ------ Shadows ----- */
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#ifndef MAX_CASCADE_NUM
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# define MAX_CASCADE_NUM 4
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#endif
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struct ShadowData {
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vec4 near_far_bias_exp;
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vec4 shadow_data_start_end;
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vec4 contact_shadow_data;
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};
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struct ShadowCubeData {
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vec4 position;
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};
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struct ShadowCascadeData {
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mat4 shadowmat[MAX_CASCADE_NUM];
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vec4 split_start_distances;
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vec4 split_end_distances;
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};
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/* convenience aliases */
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#define sh_near near_far_bias_exp.x
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#define sh_far near_far_bias_exp.y
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#define sh_bias near_far_bias_exp.z
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#define sh_exp near_far_bias_exp.w
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#define sh_bleed near_far_bias_exp.w
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#define sh_tex_start shadow_data_start_end.x
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#define sh_data_start shadow_data_start_end.y
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#define sh_multi_nbr shadow_data_start_end.z
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#define sh_blur shadow_data_start_end.w
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#define sh_contact_dist contact_shadow_data.x
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#define sh_contact_offset contact_shadow_data.y
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#define sh_contact_spread contact_shadow_data.z
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#define sh_contact_thickness contact_shadow_data.w
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/* ------- Convenience functions --------- */
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vec3 mul(mat3 m, vec3 v)
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{
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return m * v;
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}
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mat3 mul(mat3 m1, mat3 m2)
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{
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return m1 * m2;
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}
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vec3 transform_direction(mat4 m, vec3 v)
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{
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return mat3(m) * v;
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}
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vec3 transform_point(mat4 m, vec3 v)
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{
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return (m * vec4(v, 1.0)).xyz;
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}
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vec3 project_point(mat4 m, vec3 v)
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{
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vec4 tmp = m * vec4(v, 1.0);
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return tmp.xyz / tmp.w;
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}
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#define min3(a, b, c) min(a, min(b, c))
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#define min4(a, b, c, d) min(a, min3(b, c, d))
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#define min5(a, b, c, d, e) min(a, min4(b, c, d, e))
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#define min6(a, b, c, d, e, f) min(a, min5(b, c, d, e, f))
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#define min7(a, b, c, d, e, f, g) min(a, min6(b, c, d, e, f, g))
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#define min8(a, b, c, d, e, f, g, h) min(a, min7(b, c, d, e, f, g, h))
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#define min9(a, b, c, d, e, f, g, h, i) min(a, min8(b, c, d, e, f, g, h, i))
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#define max3(a, b, c) max(a, max(b, c))
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#define max4(a, b, c, d) max(a, max3(b, c, d))
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#define max5(a, b, c, d, e) max(a, max4(b, c, d, e))
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#define max6(a, b, c, d, e, f) max(a, max5(b, c, d, e, f))
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#define max7(a, b, c, d, e, f, g) max(a, max6(b, c, d, e, f, g))
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#define max8(a, b, c, d, e, f, g, h) max(a, max7(b, c, d, e, f, g, h))
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#define max9(a, b, c, d, e, f, g, h, i) max(a, max8(b, c, d, e, f, g, h, i))
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#define avg3(a, b, c) (a + b + c) * (1.0 / 3.0)
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#define avg4(a, b, c, d) (a + b + c + d) * (1.0 / 4.0)
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#define avg5(a, b, c, d, e) (a + b + c + d + e) * (1.0 / 5.0)
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#define avg6(a, b, c, d, e, f) (a + b + c + d + e + f) * (1.0 / 6.0)
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#define avg7(a, b, c, d, e, f, g) (a + b + c + d + e + f + g) * (1.0 / 7.0)
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#define avg8(a, b, c, d, e, f, g, h) (a + b + c + d + e + f + g + h) * (1.0 / 8.0)
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#define avg9(a, b, c, d, e, f, g, h, i) (a + b + c + d + e + f + g + h + i) * (1.0 / 9.0)
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float min_v2(vec2 v)
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{
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return min(v.x, v.y);
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}
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float min_v3(vec3 v)
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{
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return min(v.x, min(v.y, v.z));
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}
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float max_v2(vec2 v)
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{
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return max(v.x, v.y);
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}
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float max_v3(vec3 v)
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{
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return max(v.x, max(v.y, v.z));
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}
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float sum(vec2 v)
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{
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return dot(vec2(1.0), v);
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}
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float sum(vec3 v)
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{
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return dot(vec3(1.0), v);
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}
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float sum(vec4 v)
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{
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return dot(vec4(1.0), v);
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}
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float saturate(float a)
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{
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return clamp(a, 0.0, 1.0);
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}
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vec2 saturate(vec2 a)
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{
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return clamp(a, 0.0, 1.0);
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}
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vec3 saturate(vec3 a)
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{
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return clamp(a, 0.0, 1.0);
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}
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vec4 saturate(vec4 a)
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{
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return clamp(a, 0.0, 1.0);
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}
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float distance_squared(vec2 a, vec2 b)
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{
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a -= b;
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return dot(a, a);
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}
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float distance_squared(vec3 a, vec3 b)
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{
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a -= b;
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return dot(a, a);
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}
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float len_squared(vec3 a)
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{
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return dot(a, a);
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}
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float inverse_distance(vec3 V)
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{
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return max(1 / length(V), 1e-8);
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}
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vec2 mip_ratio_interp(float mip)
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{
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float low_mip = floor(mip);
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return mix(mipRatio[int(low_mip)], mipRatio[int(low_mip + 1.0)], mip - low_mip);
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}
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/* ------- RNG ------- */
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float wang_hash_noise(uint s)
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{
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s = (s ^ 61u) ^ (s >> 16u);
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s *= 9u;
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s = s ^ (s >> 4u);
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s *= 0x27d4eb2du;
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s = s ^ (s >> 15u);
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return fract(float(s) / 4294967296.0);
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}
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/* ------- Fast Math ------- */
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/* [Drobot2014a] Low Level Optimizations for GCN */
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float fast_sqrt(float v)
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{
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return intBitsToFloat(0x1fbd1df5 + (floatBitsToInt(v) >> 1));
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}
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vec2 fast_sqrt(vec2 v)
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{
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return intBitsToFloat(0x1fbd1df5 + (floatBitsToInt(v) >> 1));
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}
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/* [Eberly2014] GPGPU Programming for Games and Science */
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float fast_acos(float v)
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{
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float res = -0.156583 * abs(v) + M_PI_2;
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res *= fast_sqrt(1.0 - abs(v));
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return (v >= 0) ? res : M_PI - res;
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}
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vec2 fast_acos(vec2 v)
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{
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vec2 res = -0.156583 * abs(v) + M_PI_2;
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res *= fast_sqrt(1.0 - abs(v));
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v.x = (v.x >= 0) ? res.x : M_PI - res.x;
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v.y = (v.y >= 0) ? res.y : M_PI - res.y;
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return v;
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}
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float point_plane_projection_dist(vec3 lineorigin, vec3 planeorigin, vec3 planenormal)
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{
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return dot(planenormal, planeorigin - lineorigin);
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}
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float line_plane_intersect_dist(vec3 lineorigin,
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vec3 linedirection,
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vec3 planeorigin,
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vec3 planenormal)
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{
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return dot(planenormal, planeorigin - lineorigin) / dot(planenormal, linedirection);
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}
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float line_plane_intersect_dist(vec3 lineorigin, vec3 linedirection, vec4 plane)
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{
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vec3 plane_co = plane.xyz * (-plane.w / len_squared(plane.xyz));
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vec3 h = lineorigin - plane_co;
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return -dot(plane.xyz, h) / dot(plane.xyz, linedirection);
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}
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vec3 line_plane_intersect(vec3 lineorigin, vec3 linedirection, vec3 planeorigin, vec3 planenormal)
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{
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float dist = line_plane_intersect_dist(lineorigin, linedirection, planeorigin, planenormal);
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return lineorigin + linedirection * dist;
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}
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vec3 line_plane_intersect(vec3 lineorigin, vec3 linedirection, vec4 plane)
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{
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float dist = line_plane_intersect_dist(lineorigin, linedirection, plane);
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return lineorigin + linedirection * dist;
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}
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float line_aligned_plane_intersect_dist(vec3 lineorigin, vec3 linedirection, vec3 planeorigin)
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{
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/* aligned plane normal */
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vec3 L = planeorigin - lineorigin;
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float diskdist = length(L);
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vec3 planenormal = -normalize(L);
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return -diskdist / dot(planenormal, linedirection);
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}
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vec3 line_aligned_plane_intersect(vec3 lineorigin, vec3 linedirection, vec3 planeorigin)
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{
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float dist = line_aligned_plane_intersect_dist(lineorigin, linedirection, planeorigin);
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if (dist < 0) {
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/* if intersection is behind we fake the intersection to be
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* really far and (hopefully) not inside the radius of interest */
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dist = 1e16;
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}
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return lineorigin + linedirection * dist;
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}
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float line_unit_sphere_intersect_dist(vec3 lineorigin, vec3 linedirection)
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{
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float a = dot(linedirection, linedirection);
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float b = dot(linedirection, lineorigin);
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float c = dot(lineorigin, lineorigin) - 1;
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float dist = 1e15;
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float determinant = b * b - a * c;
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if (determinant >= 0) {
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dist = (sqrt(determinant) - b) / a;
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}
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return dist;
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}
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float line_unit_box_intersect_dist(vec3 lineorigin, vec3 linedirection)
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{
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/* https://seblagarde.wordpress.com/2012/09/29/image-based-lighting-approaches-and-parallax-corrected-cubemap/ */
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vec3 firstplane = (vec3(1.0) - lineorigin) / linedirection;
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vec3 secondplane = (vec3(-1.0) - lineorigin) / linedirection;
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vec3 furthestplane = max(firstplane, secondplane);
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return min_v3(furthestplane);
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}
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/* Return texture coordinates to sample Surface LUT */
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vec2 lut_coords(float cosTheta, float roughness)
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{
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float theta = acos(cosTheta);
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vec2 coords = vec2(roughness, theta / M_PI_2);
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/* scale and bias coordinates, for correct filtered lookup */
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return coords * (LUT_SIZE - 1.0) / LUT_SIZE + 0.5 / LUT_SIZE;
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}
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vec2 lut_coords_ltc(float cosTheta, float roughness)
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{
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vec2 coords = vec2(roughness, sqrt(1.0 - cosTheta));
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/* scale and bias coordinates, for correct filtered lookup */
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return coords * (LUT_SIZE - 1.0) / LUT_SIZE + 0.5 / LUT_SIZE;
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}
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/* -- Tangent Space conversion -- */
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vec3 tangent_to_world(vec3 vector, vec3 N, vec3 T, vec3 B)
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{
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return T * vector.x + B * vector.y + N * vector.z;
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}
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vec3 world_to_tangent(vec3 vector, vec3 N, vec3 T, vec3 B)
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{
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return vec3(dot(T, vector), dot(B, vector), dot(N, vector));
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}
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void make_orthonormal_basis(vec3 N, out vec3 T, out vec3 B)
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{
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vec3 UpVector = abs(N.z) < 0.99999 ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0);
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T = normalize(cross(UpVector, N));
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B = cross(N, T);
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}
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/* ---- Opengl Depth conversion ---- */
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float linear_depth(bool is_persp, float z, float zf, float zn)
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{
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if (is_persp) {
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return (zn * zf) / (z * (zn - zf) + zf);
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}
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else {
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return (z * 2.0 - 1.0) * zf;
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}
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}
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float buffer_depth(bool is_persp, float z, float zf, float zn)
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{
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if (is_persp) {
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return (zf * (zn - z)) / (z * (zn - zf));
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}
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else {
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return (z / (zf * 2.0)) + 0.5;
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}
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}
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float get_view_z_from_depth(float depth)
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{
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if (ProjectionMatrix[3][3] == 0.0) {
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float d = 2.0 * depth - 1.0;
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return -ProjectionMatrix[3][2] / (d + ProjectionMatrix[2][2]);
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}
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else {
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return viewVecs[0].z + depth * viewVecs[1].z;
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}
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}
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float get_depth_from_view_z(float z)
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{
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if (ProjectionMatrix[3][3] == 0.0) {
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float d = (-ProjectionMatrix[3][2] / z) - ProjectionMatrix[2][2];
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return d * 0.5 + 0.5;
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}
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else {
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return (z - viewVecs[0].z) / viewVecs[1].z;
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}
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}
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vec2 get_uvs_from_view(vec3 view)
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{
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vec3 ndc = project_point(ProjectionMatrix, view);
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return ndc.xy * 0.5 + 0.5;
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}
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vec3 get_view_space_from_depth(vec2 uvcoords, float depth)
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{
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if (ProjectionMatrix[3][3] == 0.0) {
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return vec3(viewVecs[0].xy + uvcoords * viewVecs[1].xy, 1.0) * get_view_z_from_depth(depth);
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}
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else {
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return viewVecs[0].xyz + vec3(uvcoords, depth) * viewVecs[1].xyz;
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}
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}
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vec3 get_world_space_from_depth(vec2 uvcoords, float depth)
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{
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return (ViewMatrixInverse * vec4(get_view_space_from_depth(uvcoords, depth), 1.0)).xyz;
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}
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vec3 get_specular_reflection_dominant_dir(vec3 N, vec3 V, float roughness)
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{
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vec3 R = -reflect(V, N);
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float smoothness = 1.0 - roughness;
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float fac = smoothness * (sqrt(smoothness) + roughness);
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return normalize(mix(N, R, fac));
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}
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float specular_occlusion(float NV, float AO, float roughness)
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{
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return saturate(pow(NV + AO, roughness) - 1.0 + AO);
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}
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/* --- Refraction utils --- */
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float ior_from_f0(float f0)
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{
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float f = sqrt(f0);
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return (-f - 1.0) / (f - 1.0);
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}
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float f0_from_ior(float eta)
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{
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float A = (eta - 1.0) / (eta + 1.0);
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return A * A;
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}
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vec3 get_specular_refraction_dominant_dir(vec3 N, vec3 V, float roughness, float ior)
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{
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/* TODO: This a bad approximation. Better approximation should fit
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* the refracted vector and roughness into the best prefiltered reflection
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* lobe. */
|
|
/* Correct the IOR for ior < 1.0 to not see the abrupt delimitation or the TIR */
|
|
ior = (ior < 1.0) ? mix(ior, 1.0, roughness) : ior;
|
|
float eta = 1.0 / ior;
|
|
|
|
float NV = dot(N, -V);
|
|
|
|
/* Custom Refraction. */
|
|
float k = 1.0 - eta * eta * (1.0 - NV * NV);
|
|
k = max(0.0, k); /* Only this changes. */
|
|
vec3 R = eta * -V - (eta * NV + sqrt(k)) * N;
|
|
|
|
return R;
|
|
}
|
|
|
|
float get_btdf_lut(sampler2DArray btdf_lut_tex, float NV, float roughness, float ior)
|
|
{
|
|
const vec3 lut_scale_bias_texel_size = vec3((LUT_SIZE - 1.0), 0.5, 1.5) / LUT_SIZE;
|
|
|
|
vec3 coords;
|
|
/* Try to compensate for the low resolution and interpolation error. */
|
|
coords.x = (ior > 1.0) ? (0.9 + lut_scale_bias_texel_size.z) +
|
|
(0.1 - lut_scale_bias_texel_size.z) * f0_from_ior(ior) :
|
|
(0.9 + lut_scale_bias_texel_size.z) * ior * ior;
|
|
coords.y = 1.0 - saturate(NV);
|
|
coords.xy *= lut_scale_bias_texel_size.x;
|
|
coords.xy += lut_scale_bias_texel_size.y;
|
|
|
|
const float lut_lvl_ofs = 4.0; /* First texture lvl of roughness. */
|
|
const float lut_lvl_scale = 16.0; /* How many lvl of roughness in the lut. */
|
|
|
|
float mip = roughness * lut_lvl_scale;
|
|
float mip_floor = floor(mip);
|
|
|
|
coords.z = lut_lvl_ofs + mip_floor + 1.0;
|
|
float btdf_high = textureLod(btdf_lut_tex, coords, 0.0).r;
|
|
|
|
coords.z -= 1.0;
|
|
float btdf_low = textureLod(btdf_lut_tex, coords, 0.0).r;
|
|
|
|
float btdf = (ior == 1.0) ? 1.0 : mix(btdf_low, btdf_high, mip - coords.z);
|
|
|
|
return btdf;
|
|
}
|
|
|
|
/* ---- Encode / Decode Normal buffer data ---- */
|
|
/* From http://aras-p.info/texts/CompactNormalStorage.html
|
|
* Using Method #4: Spheremap Transform */
|
|
vec2 normal_encode(vec3 n, vec3 view)
|
|
{
|
|
float p = sqrt(n.z * 8.0 + 8.0);
|
|
return n.xy / p + 0.5;
|
|
}
|
|
|
|
vec3 normal_decode(vec2 enc, vec3 view)
|
|
{
|
|
vec2 fenc = enc * 4.0 - 2.0;
|
|
float f = dot(fenc, fenc);
|
|
float g = sqrt(1.0 - f / 4.0);
|
|
vec3 n;
|
|
n.xy = fenc * g;
|
|
n.z = 1 - f / 2;
|
|
return n;
|
|
}
|
|
|
|
/* ---- RGBM (shared multiplier) encoding ---- */
|
|
/* From http://iwasbeingirony.blogspot.fr/2010/06/difference-between-rgbm-and-rgbd.html */
|
|
|
|
/* Higher RGBM_MAX_RANGE gives imprecision issues in low intensity. */
|
|
#define RGBM_MAX_RANGE 512.0
|
|
|
|
vec4 rgbm_encode(vec3 rgb)
|
|
{
|
|
float maxRGB = max_v3(rgb);
|
|
float M = maxRGB / RGBM_MAX_RANGE;
|
|
M = ceil(M * 255.0) / 255.0;
|
|
return vec4(rgb / (M * RGBM_MAX_RANGE), M);
|
|
}
|
|
|
|
vec3 rgbm_decode(vec4 data)
|
|
{
|
|
return data.rgb * (data.a * RGBM_MAX_RANGE);
|
|
}
|
|
|
|
/* ---- RGBE (shared exponent) encoding ---- */
|
|
vec4 rgbe_encode(vec3 rgb)
|
|
{
|
|
float maxRGB = max_v3(rgb);
|
|
float fexp = ceil(log2(maxRGB));
|
|
return vec4(rgb / exp2(fexp), (fexp + 128.0) / 255.0);
|
|
}
|
|
|
|
vec3 rgbe_decode(vec4 data)
|
|
{
|
|
float fexp = data.a * 255.0 - 128.0;
|
|
return data.rgb * exp2(fexp);
|
|
}
|
|
|
|
#if 1
|
|
# define irradiance_encode rgbe_encode
|
|
# define irradiance_decode rgbe_decode
|
|
#else /* No ecoding (when using floating point format) */
|
|
# define irradiance_encode(X) (X).rgbb
|
|
# define irradiance_decode(X) (X).rgb
|
|
#endif
|
|
|
|
/* Irradiance Visibility Encoding */
|
|
#if 1
|
|
vec4 visibility_encode(vec2 accum, float range)
|
|
{
|
|
accum /= range;
|
|
|
|
vec4 data;
|
|
data.x = fract(accum.x);
|
|
data.y = floor(accum.x) / 255.0;
|
|
data.z = fract(accum.y);
|
|
data.w = floor(accum.y) / 255.0;
|
|
|
|
return data;
|
|
}
|
|
|
|
vec2 visibility_decode(vec4 data, float range)
|
|
{
|
|
return (data.xz + data.yw * 255.0) * range;
|
|
}
|
|
#else /* No ecoding (when using floating point format) */
|
|
vec4 visibility_encode(vec2 accum, float range)
|
|
{
|
|
return accum.xyxy;
|
|
}
|
|
|
|
vec2 visibility_decode(vec4 data, float range)
|
|
{
|
|
return data.xy;
|
|
}
|
|
#endif
|
|
|
|
/* Fresnel monochromatic, perfect mirror */
|
|
float F_eta(float eta, float cos_theta)
|
|
{
|
|
/* compute fresnel reflectance without explicitly computing
|
|
* the refracted direction */
|
|
float c = abs(cos_theta);
|
|
float g = eta * eta - 1.0 + c * c;
|
|
float result;
|
|
|
|
if (g > 0.0) {
|
|
g = sqrt(g);
|
|
vec2 g_c = vec2(g) + vec2(c, -c);
|
|
float A = g_c.y / g_c.x;
|
|
A *= A;
|
|
g_c *= c;
|
|
float B = (g_c.y - 1.0) / (g_c.x + 1.0);
|
|
B *= B;
|
|
result = 0.5 * A * (1.0 + B);
|
|
}
|
|
else {
|
|
result = 1.0; /* TIR (no refracted component) */
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Fresnel color blend base on fresnel factor */
|
|
vec3 F_color_blend(float eta, float fresnel, vec3 f0_color)
|
|
{
|
|
float f0 = F_eta(eta, 1.0);
|
|
float fac = saturate((fresnel - f0) / max(1e-8, 1.0 - f0));
|
|
return mix(f0_color, vec3(1.0), fac);
|
|
}
|
|
|
|
/* Fresnel */
|
|
vec3 F_schlick(vec3 f0, float cos_theta)
|
|
{
|
|
float fac = 1.0 - cos_theta;
|
|
float fac2 = fac * fac;
|
|
fac = fac2 * fac2 * fac;
|
|
|
|
/* Unreal specular matching : if specular color is below 2% intensity,
|
|
* (using green channel for intensity) treat as shadowning */
|
|
return saturate(50.0 * dot(f0, vec3(0.3, 0.6, 0.1))) * fac + (1.0 - fac) * f0;
|
|
}
|
|
|
|
/* Fresnel approximation for LTC area lights (not MRP) */
|
|
vec3 F_area(vec3 f0, vec2 lut)
|
|
{
|
|
/* Unreal specular matching : if specular color is below 2% intensity,
|
|
* treat as shadowning */
|
|
return saturate(50.0 * dot(f0, vec3(0.3, 0.6, 0.1))) * lut.y + lut.x * f0;
|
|
}
|
|
|
|
/* Fresnel approximation for IBL */
|
|
vec3 F_ibl(vec3 f0, vec2 lut)
|
|
{
|
|
/* Unreal specular matching : if specular color is below 2% intensity,
|
|
* treat as shadowning */
|
|
return saturate(50.0 * dot(f0, vec3(0.3, 0.6, 0.1))) * lut.y + lut.x * f0;
|
|
}
|
|
|
|
/* GGX */
|
|
float D_ggx_opti(float NH, float a2)
|
|
{
|
|
float tmp = (NH * a2 - NH) * NH + 1.0;
|
|
return M_PI * tmp * tmp; /* Doing RCP and mul a2 at the end */
|
|
}
|
|
|
|
float G1_Smith_GGX(float NX, float a2)
|
|
{
|
|
/* Using Brian Karis approach and refactoring by NX/NX
|
|
* this way the (2*NL)*(2*NV) in G = G1(V) * G1(L) gets canceled by the brdf denominator 4*NL*NV
|
|
* Rcp is done on the whole G later
|
|
* Note that this is not convenient for the transmission formula */
|
|
return NX + sqrt(NX * (NX - NX * a2) + a2);
|
|
/* return 2 / (1 + sqrt(1 + a2 * (1 - NX*NX) / (NX*NX) ) ); /* Reference function */
|
|
}
|
|
|
|
float bsdf_ggx(vec3 N, vec3 L, vec3 V, float roughness)
|
|
{
|
|
float a = roughness;
|
|
float a2 = a * a;
|
|
|
|
vec3 H = normalize(L + V);
|
|
float NH = max(dot(N, H), 1e-8);
|
|
float NL = max(dot(N, L), 1e-8);
|
|
float NV = max(dot(N, V), 1e-8);
|
|
|
|
float G = G1_Smith_GGX(NV, a2) * G1_Smith_GGX(NL, a2); /* Doing RCP at the end */
|
|
float D = D_ggx_opti(NH, a2);
|
|
|
|
/* Denominator is canceled by G1_Smith */
|
|
/* bsdf = D * G / (4.0 * NL * NV); /* Reference function */
|
|
return NL * a2 / (D * G); /* NL to Fit cycles Equation : line. 345 in bsdf_microfacet.h */
|
|
}
|
|
|
|
void accumulate_light(vec3 light, float fac, inout vec4 accum)
|
|
{
|
|
accum += vec4(light, 1.0) * min(fac, (1.0 - accum.a));
|
|
}
|
|
|
|
/* ----------- Cone Aperture Approximation --------- */
|
|
|
|
/* Return a fitted cone angle given the input roughness */
|
|
float cone_cosine(float r)
|
|
{
|
|
/* Using phong gloss
|
|
* roughness = sqrt(2/(gloss+2)) */
|
|
float gloss = -2 + 2 / (r * r);
|
|
/* Drobot 2014 in GPUPro5 */
|
|
// return cos(2.0 * sqrt(2.0 / (gloss + 2)));
|
|
/* Uludag 2014 in GPUPro5 */
|
|
// return pow(0.244, 1 / (gloss + 1));
|
|
/* Jimenez 2016 in Practical Realtime Strategies for Accurate Indirect Occlusion*/
|
|
return exp2(-3.32193 * r * r);
|
|
}
|
|
|
|
/* --------- Closure ---------- */
|
|
#ifdef VOLUMETRICS
|
|
|
|
struct Closure {
|
|
vec3 absorption;
|
|
vec3 scatter;
|
|
vec3 emission;
|
|
float anisotropy;
|
|
};
|
|
|
|
# define CLOSURE_DEFAULT Closure(vec3(0.0), vec3(0.0), vec3(0.0), 0.0)
|
|
|
|
Closure closure_mix(Closure cl1, Closure cl2, float fac)
|
|
{
|
|
Closure cl;
|
|
cl.absorption = mix(cl1.absorption, cl2.absorption, fac);
|
|
cl.scatter = mix(cl1.scatter, cl2.scatter, fac);
|
|
cl.emission = mix(cl1.emission, cl2.emission, fac);
|
|
cl.anisotropy = mix(cl1.anisotropy, cl2.anisotropy, fac);
|
|
return cl;
|
|
}
|
|
|
|
Closure closure_add(Closure cl1, Closure cl2)
|
|
{
|
|
Closure cl;
|
|
cl.absorption = cl1.absorption + cl2.absorption;
|
|
cl.scatter = cl1.scatter + cl2.scatter;
|
|
cl.emission = cl1.emission + cl2.emission;
|
|
cl.anisotropy = (cl1.anisotropy + cl2.anisotropy) / 2.0; /* Average phase (no multi lobe) */
|
|
return cl;
|
|
}
|
|
|
|
Closure closure_emission(vec3 rgb)
|
|
{
|
|
Closure cl = CLOSURE_DEFAULT;
|
|
cl.emission = rgb;
|
|
return cl;
|
|
}
|
|
|
|
#else /* VOLUMETRICS */
|
|
|
|
struct Closure {
|
|
vec3 radiance;
|
|
float opacity;
|
|
# ifdef USE_SSS
|
|
vec4 sss_data;
|
|
# ifdef USE_SSS_ALBEDO
|
|
vec3 sss_albedo;
|
|
# endif
|
|
# endif
|
|
vec4 ssr_data;
|
|
vec2 ssr_normal;
|
|
int ssr_id;
|
|
};
|
|
|
|
/* This is hacking ssr_id to tag transparent bsdf */
|
|
# define TRANSPARENT_CLOSURE_FLAG -2
|
|
# define REFRACT_CLOSURE_FLAG -3
|
|
# define NO_SSR -999
|
|
|
|
# ifdef USE_SSS
|
|
# ifdef USE_SSS_ALBEDO
|
|
# define CLOSURE_DEFAULT \
|
|
Closure(vec3(0.0), 1.0, vec4(0.0), vec3(0.0), vec4(0.0), vec2(0.0), -1)
|
|
# else
|
|
# define CLOSURE_DEFAULT Closure(vec3(0.0), 1.0, vec4(0.0), vec4(0.0), vec2(0.0), -1)
|
|
# endif
|
|
# else
|
|
# define CLOSURE_DEFAULT Closure(vec3(0.0), 1.0, vec4(0.0), vec2(0.0), -1)
|
|
# endif
|
|
|
|
uniform int outputSsrId;
|
|
|
|
Closure closure_mix(Closure cl1, Closure cl2, float fac)
|
|
{
|
|
Closure cl;
|
|
|
|
if (cl1.ssr_id == TRANSPARENT_CLOSURE_FLAG) {
|
|
cl1.ssr_normal = cl2.ssr_normal;
|
|
cl1.ssr_data = cl2.ssr_data;
|
|
cl1.ssr_id = cl2.ssr_id;
|
|
# ifdef USE_SSS
|
|
cl1.sss_data = cl2.sss_data;
|
|
# ifdef USE_SSS_ALBEDO
|
|
cl1.sss_albedo = cl2.sss_albedo;
|
|
# endif
|
|
# endif
|
|
}
|
|
if (cl2.ssr_id == TRANSPARENT_CLOSURE_FLAG) {
|
|
cl2.ssr_normal = cl1.ssr_normal;
|
|
cl2.ssr_data = cl1.ssr_data;
|
|
cl2.ssr_id = cl1.ssr_id;
|
|
# ifdef USE_SSS
|
|
cl2.sss_data = cl1.sss_data;
|
|
# ifdef USE_SSS_ALBEDO
|
|
cl2.sss_albedo = cl1.sss_albedo;
|
|
# endif
|
|
# endif
|
|
}
|
|
|
|
/* When mixing SSR don't blend roughness.
|
|
*
|
|
* It makes no sense to mix them really, so we take either one of them and
|
|
* tone down its specularity (ssr_data.xyz) while keeping its roughness (ssr_data.w).
|
|
*/
|
|
if (cl1.ssr_id == outputSsrId) {
|
|
cl.ssr_data = mix(cl1.ssr_data.xyzw, vec4(vec3(0.0), cl1.ssr_data.w), fac);
|
|
cl.ssr_normal = cl1.ssr_normal;
|
|
cl.ssr_id = cl1.ssr_id;
|
|
}
|
|
else {
|
|
cl.ssr_data = mix(vec4(vec3(0.0), cl2.ssr_data.w), cl2.ssr_data.xyzw, fac);
|
|
cl.ssr_normal = cl2.ssr_normal;
|
|
cl.ssr_id = cl2.ssr_id;
|
|
}
|
|
|
|
cl.opacity = mix(cl1.opacity, cl2.opacity, fac);
|
|
cl.radiance = mix(cl1.radiance * cl1.opacity, cl2.radiance * cl2.opacity, fac);
|
|
cl.radiance /= max(1e-8, cl.opacity);
|
|
|
|
# ifdef USE_SSS
|
|
cl.sss_data.rgb = mix(cl1.sss_data.rgb, cl2.sss_data.rgb, fac);
|
|
cl.sss_data.a = (cl1.sss_data.a > 0.0) ? cl1.sss_data.a : cl2.sss_data.a;
|
|
# ifdef USE_SSS_ALBEDO
|
|
/* TODO Find a solution to this. Dither? */
|
|
cl.sss_albedo = (cl1.sss_data.a > 0.0) ? cl1.sss_albedo : cl2.sss_albedo;
|
|
# endif
|
|
# endif
|
|
|
|
return cl;
|
|
}
|
|
|
|
Closure closure_add(Closure cl1, Closure cl2)
|
|
{
|
|
Closure cl = (cl1.ssr_id == outputSsrId) ? cl1 : cl2;
|
|
cl.radiance = cl1.radiance + cl2.radiance;
|
|
# ifdef USE_SSS
|
|
cl.sss_data = (cl1.sss_data.a > 0.0) ? cl1.sss_data : cl2.sss_data;
|
|
/* Add radiance that was supposed to be filtered but was rejected. */
|
|
cl.radiance += (cl1.sss_data.a > 0.0) ? cl2.sss_data.rgb : cl1.sss_data.rgb;
|
|
# ifdef USE_SSS_ALBEDO
|
|
/* TODO Find a solution to this. Dither? */
|
|
cl.sss_albedo = (cl1.sss_data.a > 0.0) ? cl1.sss_albedo : cl2.sss_albedo;
|
|
# endif
|
|
# endif
|
|
cl.opacity = saturate(cl1.opacity + cl2.opacity);
|
|
return cl;
|
|
}
|
|
|
|
Closure closure_emission(vec3 rgb)
|
|
{
|
|
Closure cl = CLOSURE_DEFAULT;
|
|
cl.radiance = rgb;
|
|
return cl;
|
|
}
|
|
|
|
/* Breaking this across multiple lines causes issues for some older GLSL compilers. */
|
|
/* clang-format off */
|
|
# if defined(MESH_SHADER) && !defined(USE_ALPHA_HASH) && !defined(USE_ALPHA_CLIP) && !defined(SHADOW_SHADER) && !defined(USE_MULTIPLY)
|
|
/* clang-format on */
|
|
layout(location = 0) out vec4 fragColor;
|
|
layout(location = 1) out vec4 ssrNormals;
|
|
layout(location = 2) out vec4 ssrData;
|
|
# ifdef USE_SSS
|
|
layout(location = 3) out vec4 sssData;
|
|
# ifdef USE_SSS_ALBEDO
|
|
layout(location = 4) out vec4 sssAlbedo;
|
|
# endif /* USE_SSS_ALBEDO */
|
|
# endif /* USE_SSS */
|
|
|
|
Closure nodetree_exec(void); /* Prototype */
|
|
|
|
# if defined(USE_ALPHA_BLEND_VOLUMETRICS)
|
|
/* Prototype because this file is included before volumetric_lib.glsl */
|
|
vec4 volumetric_resolve(vec4 scene_color, vec2 frag_uvs, float frag_depth);
|
|
# endif
|
|
|
|
# define NODETREE_EXEC
|
|
void main()
|
|
{
|
|
Closure cl = nodetree_exec();
|
|
# ifndef USE_ALPHA_BLEND
|
|
/* Prevent alpha hash material writing into alpha channel. */
|
|
cl.opacity = 1.0;
|
|
# endif
|
|
|
|
# if defined(USE_ALPHA_BLEND_VOLUMETRICS)
|
|
/* XXX fragile, better use real viewport resolution */
|
|
vec2 uvs = gl_FragCoord.xy / vec2(2 * textureSize(maxzBuffer, 0).xy);
|
|
fragColor.rgb = volumetric_resolve(vec4(cl.radiance, cl.opacity), uvs, gl_FragCoord.z).rgb;
|
|
fragColor.a = cl.opacity;
|
|
# else
|
|
fragColor = vec4(cl.radiance, cl.opacity);
|
|
# endif
|
|
|
|
ssrNormals = cl.ssr_normal.xyyy;
|
|
ssrData = cl.ssr_data;
|
|
# ifdef USE_SSS
|
|
sssData = cl.sss_data;
|
|
# ifdef USE_SSS_ALBEDO
|
|
sssAlbedo = cl.sss_albedo.rgbb;
|
|
# endif
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|
# endif
|
|
|
|
/* For Probe capture */
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|
# ifdef USE_SSS
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|
# ifdef USE_SSS_ALBEDO
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|
fragColor.rgb += cl.sss_data.rgb * cl.sss_albedo.rgb * float(!sssToggle);
|
|
# else
|
|
fragColor.rgb += cl.sss_data.rgb * float(!sssToggle);
|
|
# endif
|
|
# endif
|
|
}
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|
|
|
# endif /* MESH_SHADER && !SHADOW_SHADER */
|
|
|
|
#endif /* VOLUMETRICS */
|
|
|
|
Closure nodetree_exec(void); /* Prototype */
|
|
|
|
/* TODO find a better place */
|
|
#ifdef USE_MULTIPLY
|
|
|
|
out vec4 fragColor;
|
|
|
|
# define NODETREE_EXEC
|
|
void main()
|
|
{
|
|
Closure cl = nodetree_exec();
|
|
fragColor = vec4(mix(vec3(1.0), cl.radiance, cl.opacity), 1.0);
|
|
}
|
|
#endif
|